At the certain rate of simple interest, a certain sum doubles

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At the certain rate of simple interest, a certain sum doubles itself in 10 years. It will treble itself in ?

Let principal = P. Then, S. I = P. and Time = 10 years
∴ Required time = [(n - 1) x t] / (m - 1)
= [(3 - 1) x 10] / (2 - 1)
= 20 years